.Grandepa{
    border: 5px saddlebrown solid;
    width: 800px;
    height: 800px;
}
.Father{
    border: 5px slateblue solid;
    width: 600px;
    height: 600px;
}
.Son{
    border: 5px pink solid;
    width: 400px;
    height: 400px;
}